Paint-on Coating to Identify Stainless Steel
Paint-on Coating to Identify Stainless Steel
(OP)
My lab has been approached by one of our vendors for a coating that when painted onto stainless remains clear and turns a coppery color for other steel grades. They had some, but lost the bottle.
Anybody ever hear of something like this?
Anybody ever hear of something like this?





RE: Paint-on Coating to Identify Stainless Steel
Cu+2 + Fe(metal) = Cu(metal) + Fe+2
The solution and procedure and limitations (on which SS grades it can test passsivation & which give false positive rxn., turning coppery red anyway) are given in ASTM A967. A portion:
"17.2 The test solution is prepared by dissolving 4 g of
copper sulfate pentahydrate (CuSO4ยท5H2O) in 250 mL of
distilled water to which 1 mL of sulfuric acid (H2SO4, sp gr
1.84) has been added."
http:/
For the free version, get the old specs.
QQ-P-35C PASSIVATION TREATMENTS FOR CORROSION-RESISTANT STEEL and
MIL-STD-753C CORROSION-RESISTANT STEEL PARTS: SAMPLING, INSPECTION AND TESTING FOR SURFACE PASSIVATION,
from ASSIST: http:
http:
RE: Paint-on Coating to Identify Stainless Steel